This is a proprietary lithium-ion rechargeable protected-cell battery. Its capacity is 4000 mAh. This battery was designed to be used in and recharged with our Maelstrom Regen MMU-X3R only. It will not work with any other lights.
Warranty for Consumables: Since the battery is considered a "consumable" FOURSEVENS product, its warranty is 12 months. Please see our Warranty page for information about our FOURSEVENS warranties.